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I don't use that module, but I would suspect it is required to maintain a state during uploads. I would just say it is needed by the photo gallery application.
Cookies that are considered essential for Xoops (or any CMS) to provide the requested service (viewing the site) are OK to set. For example, Xoops PHPSESSID falls into that category.
The kinds of cookie that now require you to ask permission before setting them are:
* Tracking cookies used by services such as Google analytics, Web-Trends, Core Metrics etc.
* Tracking cookies set by third-party advertisers.
* Cookies that use search queries and page tracking to display related products on return visits, e.g. to an ecommerce site.
* Cookies that store details to personalise your visit.
These cookies may be beneficial to the site operators, but they are NOT considered essential for people to view the site, so they fall under the new rules.
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